Apple released iOS 13.7 for all last week, which includes a major expansion of the COVID-19 Exposure Notification platform. Following this release, Apple has today stopped signing iOS 13.6.1. This means that users can no longer downgrade from iOS 13.7 to iOS 13.6.1.
iOS 13.7 allows users to enable COVID-19 exposure alerts directly in the Settings app on the iPhone. After enabling exposure alerts in the Settings app, your iPhone starts monitoring with Bluetooth to log possible exposures, so you can be notified of a potential COVID-19 exposure based on the guidelines set by your local public health authority.
Before that, iOS 1
Going back to older iOS builds is common for those with jailbroken devices, and can sometimes also be helpful for users who experience significant errors after upgrading to the latest version of iOS.
Now that Apple has stopped signing iOS 13.6.1, users can no longer downgrade to that version of iOS from a newer version. By preventing users from reinstalling older versions of iOS, Apple ensures that customers get the most stable experience currently available.
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